selftests/xsk: Add new test case for AF_XDP under max ring sizes

Introduce a test case to evaluate AF_XDP's robustness by pushing hardware
and software ring sizes to their limits. This test ensures AF_XDP's
reliability amidst potential producer/consumer throttling due to maximum
ring utilization. The testing strategy includes:

1. Configuring rings to their maximum allowable sizes.
2. Executing a series of tests across diverse batch sizes to assess
   system's behavior under different configurations.

Signed-off-by: Tushar Vyavahare <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Magnus Karlsson <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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